// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include <unicode/utext.h>

#include <memory>

#include <string_view>

#include "CLucene.h"

#include "CLucene/analysis/AnalysisHeader.h"

#include "common/cast_set.h"

#include "storage/index/inverted/util/reader.h"

using namespace lucene::analysis;

namespace doris::segment_v2::inverted_index {

#include "common/compile_check_begin.h"

class DorisTokenizer;

using TokenizerPtr = std::shared_ptr<DorisTokenizer>;

using TokenStreamPtr = std::shared_ptr<TokenStream>;

/**

 * All custom tokenizers and token_filters must use the following functions 

 * to set token information. Using these unified set methods helps avoid 

 * unnecessary data copying.

 * 

 * Note: Must not mix with other set methods

 */

class DorisTokenStream {

public:

    DorisTokenStream() = default;

    virtual ~DorisTokenStream() = default;

    void set(Token* t, const std::string_view& term, int32_t pos = 1) {

        t->setTextNoCopy(term.data(), cast_set<int32_t>(term.size()));

        t->setPositionIncrement(pos);

    }

    void set_text(Token* t, const std::string_view& term) {

        t->setTextNoCopy(term.data(), cast_set<int32_t>(term.size()));

    }

    int32_t get_position_increment(Token* t) { return t->getPositionIncrement(); }

    void set_position_increment(Token* t, int32_t pos) { t->setPositionIncrement(pos); }

};

class TokenStreamWrapper : public TokenStream {

public:

    explicit TokenStreamWrapper(std::shared_ptr<TokenStream> ts) : _impl(std::move(ts)) {}

    ~TokenStreamWrapper() override = default;

    Token* next(Token* token) override { return _impl->next(token); }

    void close() override { _impl->close(); }

    void reset() override { _impl->reset(); }

private:

    std::shared_ptr<TokenStream> _impl;

};

class TokenStreamComponents {

public:

    TokenStreamComponents(TokenizerPtr tokenizer, TokenStreamPtr result)

            : _source(std::move(tokenizer)), _sink(std::move(result)) {}

    void set_reader(const ReaderPtr& reader);

    TokenStreamPtr get_token_stream();

    TokenizerPtr get_source();

private:

    TokenizerPtr _source;

    TokenStreamPtr _sink;

};

using TokenStreamComponentsPtr = std::shared_ptr<TokenStreamComponents>;

}; // namespace doris::segment_v2::inverted_index

#include "common/compile_check_end.h"